Chapter 10- Forces and motion

Question 1

What are the two types of forces

Answer 1

Contact and noncontact

Question 2

What are the two kinds of contact forces

Answer 2

Impact forces, when surfaces Touch

strain forces, when a force builds up in the object on which a force is acting

Question 3

Give an example of a strain force

Answer 3

The force inside of squashed Sponge ball. The Tensionis a strain force that builds up in A stretch elastic band

Question 4

What is a noncontact force

Answer 4

Noncontact force that is exerted by one object on another without the objects touching.

Question 5

Give an example of a noncontact force

Answer 5

Magnetic, electrostatic, gravitational forces

Question 6

What is friction

Answer 6

Friction is a contact force that occurs between two surfaces when a push or pool could cause one service to move over the other

Question 7

How is static friction created

Answer 7

Static friction, it’s a small pushing Or pulling force is generated to slide one surface over Another A frictional force of similar strength is generated between the surfaces in the opposite direction.

Question 8

How do you increase the static friction

Answer 8

You can increase it by increasing the pushing or pulling force

Question 9

What is static friction?

Answer 9

The force that exist between two surfaces when there is no movement

Question 10

How is sliding friction created?

Answer 10

If the pushing or pulling force is further increased, one surface will slide over the other because the static friction cannot stop it.

Question 11

What does the sliding Frictional force stop

Answer 11

The two surfaces from sliding

Question 12

How do you reduce friction

Answer 12

A liquid applied to two surfaces feels the hollows and makes the contact between the surface is smoother

Question 13

What do all surfaces have

Answer 13

Bumps and hollows

Question 14

How do you increase friction?

Answer 14

If you press the surfaces it makes the projections and hollows lock together making a surface rougher also increases friction

Question 15

What is air resistance?

Answer 15

What an object moves through the air, the object pushes on the air and the air pushes back with Force cold air resistance

Question 16

How is air resistance increased

Answer 16

By the object moving through the air increasing in speed, the air pushes back in the greater the resistance pushing back on it

Question 17

What is a steam line shape and when is it used

Answer 17

A shape with a pointed front, or a wedge shape, and curved body

It is used on Airplanes and cars

Question 18

How does the Steamline shape work?

Answer 18

The shape is made to the air can flow over the Body easily, which reduces the air resistance

Question 19

What is the mass of an Object?

Answer 19

The mass of an object is the amount of matter in it and is measured in grams or kilograms

Question 20

What is the weight of an object

Answer 20

Weight of an object is the pool of the earths gravity on the object and is measured in newtons

Question 21

How do you convert mass to newtons

Answer 21

1 kg of mess is almost ten newtons

Question 22

What is a field

Answer 22

The region in which a noncontact force Acts

Question 23

How do you calculate the gravitational field strength?

Answer 23

You divide the weight by mass.

Question 24

What is the elastic limit

Answer 24

If the size of the mass is increased, the extension of the spring increases in proportion, up to a point called the elastic limit

Question 25

What happens if you exceed the elastic limit

Answer 25

The spring will be permanently deformed and cannot return to its original length

Question 26

What is a stop that is used in Laboratory investigations

Answer 26

The spring balance, it contains a spring in a device called a stop which prevents the spring from being stretched beyond It’s elastic limit

Question 27

What is the spring used for

Answer 27

It can be used to measure and compare forces because it stretches in a regular way and forces are applied to it

Question 28

What is the amount of stretch on

Answer 28

The amount of stretches measured on a scale which is calibrated into Newtons

Question 29

When doing a graph on time and distance which unit should be on the X axis

Answer 29

Time in seconds the distance should be on the Y axis

Question 30

What is the pressure and how do you calculate it

Answer 30

Wish I was a term used to describe the force acting over an area of no one size it’s equation is
Pressure=force
area

Question 31

Do units for pressure are…

Answer 31

N/cm squared

N/m Squared

Question 32

Ask nana about pressure exerted by a solid look in camera roll

Answer 32

Did I get help

Question 33

Pressure at the bottom of the liquid is… Then that at the top of the liquid due to the…

Answer 33

The pressure the bottom of the liquid is higher than that at the top due to the weight of liquid above it

Question 34

Ask Nanna❤️ for help by pressure exerted by gas

Answer 34

Look in your camera page 67

Question 35

What is density and how do you work it out

Answer 35

The density of a substance is measured by the amount of matter that is present in a certain volume of it. It can be defined by this equation Density=mass over volume

Question 36

What are the units for density

Answer 36

g/cm cubed

Kg/m cubed

Question 37

How do you find the density of a solid

Answer 37

The density of a regular shaped solid such as a cube can be found easily. The mass is found by placing it on a top in balance. The volume is found by measuring the length of its sides and multiplying them together

Question 38

There’s some ways to find the density of a regular shaped solid such as pebble

Answer 38

Finding the mess by putting it in a top pan balance

Filling a cylinder with water and then dropping the pebble inside and then measuring how much the water level increased

Question 39

What are the instructions of determining the density of gas

Answer 39

1-The mass of the gas container and air found by placing it on the top pan balance. This is M
2-The air is sucked it was a vacuum pump, then is placed back on the balance to find its mass. This is M 2
3-The volume of the container is measured by opening the container under water. Water replaces the vacuum so that pouring the water out until measuring cylinder gives the volume, V.
4-The density is found by using the formula M2xm1 over v

Question 40

What is the lever

Answer 40

Device that changes the direction In which a force Acts

Question 41

A lever is composed Of two arms and a…

Answer 41

Fulcrum or pivot

Question 42

The Fossett is applied to leave it to do its work is called the …

Answer 42

Effort

Question 43

The force which resists the action of the effort is called the…

Answer 43

Load

Question 44

What is the turning effect produced by a force around the fulcrum called?

Answer 44

The moment of the force

Question 45

Study the picture in your camera roll of moments

Answer 45

How old do you know every part

Question 46

How was the size of the moment found?

Answer 46

Multiplying the size of the force by the distance between the point at which the force acts and the fulcrum

Question 47

What is the word equation for moment of force?

Answer 47

Moment of force=Force X distance from the fulcrum.

Question 48

What is the moment measured in

Answer 48

Newton meters (N m)

Question 49

Explain to me how to seesaw works

Answer 49

for the seesaw to balance and the two arms to be horizontal, the moment of the weight on one arm must be equal to the moment of the way on the other

Question 50

Explain to me the law of the lever

Answer 50

When a body is in equilibrium, or balance, the sum of the clock was moments about any point, such as the fulcrum, equals the sum of the anti-clockwise moments about that point.